TY - JOUR

T1 - Verification of the Technology of Search for Hydrocarbon Pools on the Basis of the Studies of Water-Gas Equilibria (the Southern Regions of the Ob-Irtysh Interfluve)

AU - Novikov, D. A.

AU - Dultsev, F. F.

AU - Chernykh, A. V.

N1 - Funding Information: The research was conducted with the financial support from the Fundamental Research Program of the Russian Academy of Sciences (Project No. 0331-2019-0025), the RFBR (Project No. 18-05-70074 “Arctic Resources”), RFBR and the Government of the Novosibirsk Region within the scientific Projects No. 18-45-540004 and No. 19-45-540006. Publisher Copyright: © Published under licence by IOP Publishing Ltd. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/3/9

Y1 - 2021/3/9

N2 - Results obtained through the analysis of water-gas equilibria in formation waters are shown to form the basis of the technology aimed at search for hydrocarbon pools. A direct dependence of a decrease in total gas saturation, the concentrations of methane homologues and water composition on the distance from water-oil contacts was established. A connection between hydrogeochemical anomalies and hydrocarbon pools was also detected It was revealed from the nature of the equilibria that hydrocarbon pools in the Paleozoic and Mesozoic sediments of the southern parts of the Ob-Irtysh interfluve act as a conservative element of the lithosphere. Water-gas equilibria modeling revealed that the geochemical regime dominating at the major part of the territory under study is favourable for the formation and conservation of hydrocarbon pools, except for the marginal zones. Computer modeling of physicochemical equilibria and evasion-invasion processes in water-gas systems allowed us to establish the degree of groundwater saturation with gases and the nature of diffusion redistribution of gases at the boundary between hydrocarbon deposit and formation water. All waters with total gas saturation of 2.0 l/l become ultimately saturated with gases (Kg = 2.0), which means that theoretical prerequisites for the formation of hydrocarbon deposits arise. Calculations allowed us to reveal more than 30 promising objects with the high probability of detection of hydrocarbon deposits at the Bergul, Vitin, Chekovsky and other areas.

AB - Results obtained through the analysis of water-gas equilibria in formation waters are shown to form the basis of the technology aimed at search for hydrocarbon pools. A direct dependence of a decrease in total gas saturation, the concentrations of methane homologues and water composition on the distance from water-oil contacts was established. A connection between hydrogeochemical anomalies and hydrocarbon pools was also detected It was revealed from the nature of the equilibria that hydrocarbon pools in the Paleozoic and Mesozoic sediments of the southern parts of the Ob-Irtysh interfluve act as a conservative element of the lithosphere. Water-gas equilibria modeling revealed that the geochemical regime dominating at the major part of the territory under study is favourable for the formation and conservation of hydrocarbon pools, except for the marginal zones. Computer modeling of physicochemical equilibria and evasion-invasion processes in water-gas systems allowed us to establish the degree of groundwater saturation with gases and the nature of diffusion redistribution of gases at the boundary between hydrocarbon deposit and formation water. All waters with total gas saturation of 2.0 l/l become ultimately saturated with gases (Kg = 2.0), which means that theoretical prerequisites for the formation of hydrocarbon deposits arise. Calculations allowed us to reveal more than 30 promising objects with the high probability of detection of hydrocarbon deposits at the Bergul, Vitin, Chekovsky and other areas.

UR - http://www.scopus.com/inward/record.url?scp=85102725947&partnerID=8YFLogxK

U2 - 10.1088/1755-1315/666/3/032097

DO - 10.1088/1755-1315/666/3/032097

M3 - Conference article

AN - SCOPUS:85102725947

VL - 666

JO - IOP Conference Series: Earth and Environmental Science

JF - IOP Conference Series: Earth and Environmental Science

SN - 1755-1307

IS - 3

M1 - 032097

T2 - 2020 International Science and Technology Conference on Earth Science, ISTCEarthScience 2020

Y2 - 6 October 2020 through 9 October 2020

ER -